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System and method for coupled utilization of fruit and vegetable waste anaerobic fermentation and waste heat of biogas generator

A technology of generator waste heat and anaerobic fermentation, which is applied in the direction of bioreactor/fermenter combination, fuel system, engine components, etc., can solve the problems of lack of resource utilization of solid residue, reduction of raw material methane yield, consumption of organic carbon, etc. , to achieve the effect of improving the comprehensive energy and resource utilization efficiency of fruit and vegetable waste, improving the gas production rate of raw materials, and improving the treatment efficiency

Active Publication Date: 2017-07-07
深圳市海吉星环保有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process also has certain deficiencies: 1) Before the hydrolytic acidification liquid enters the methanation reactor, due to the low pH value, a large amount of alkali needs to be added to adjust the pH value to 7.0-8.0; 2) The secondary acidification of the solid residue uses Micro-aerobic process, the obvious weakness of aerobic process is the consumption of organic carbon, and the process requires aeration, the energy consumption is relatively high, and the total raw material methane yield is reduced; 3) The process lacks the final resource utilization of solid residues

Method used

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  • System and method for coupled utilization of fruit and vegetable waste anaerobic fermentation and waste heat of biogas generator

Examples

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Effect test

Embodiment 1

[0050] Collect 100 tons of vegetable waste from a vegetable planting professional cooperative. Since the vegetable waste is collected at the source, there is basically no impurity, so the pretreatment device 1 is only a crusher; the solid content of the vegetable waste is 12%, and the vegetable waste is crushed to a particle size ≤ 50mm , put it into conditioning and tempering preheating pool 2 after crushing, add 50 tons of biogas slurry from mesophilic anaerobic digester 3, adjust the total solid concentration of 2 materials in the conditioning and tempering preheating pool to be 8%, and pass through the first hot water tank 13 hot water to the temperature-increasing coil in the tempering preheating pool 2, so that the temperature of the material in the tempering preheating pool 2 is 40°C; pump the fruit and vegetable waste after conditioning and tempering into the first extrusion solid-liquid separation Machine 4 carries out solid-liquid separation to obtain 124.5 tons of ju...

Embodiment 2

[0052] Collect 130 tons of fruit and vegetable waste from a bazaar, sort and remove 10 tons of soft plastic, foam, rope and other sundries through the pretreatment device, and the solid content of the remaining 120 tons of fruit and vegetable waste is 10%. Crushed to a particle size ≤ 50mm, put it into the tempering preheating tank after crushing, add 80 tons of biogas slurry from the mesophilic anaerobic digester 3, adjust the total solid concentration of the material in the conditioning and tempering preheating tank 2 to 6%, and The hot water from the first hot water tank 13 is sent to the temperature-increasing coil in the tempering and preheating pool 2, so that the temperature of the material in the tempering and preheating pool 2 is 35°C; Squeeze solid-liquid separator 4 to carry out solid-liquid separation to obtain 177.5 tons of juice and 22.5 tons of solid residue, the total solid content of solid residue is 40%, and the total chemical oxygen demand (COD) of juice is 1...

Embodiment 3

[0054]Collect 200 tons of fruit and vegetable waste from a fruit and vegetable logistics park, sort and remove 20 tons of soft plastic, foam, baskets, wood boards, quilts, ropes and other sundries through the pretreatment device 1, and the remaining 180 tons of fruit and vegetable waste are solid The content is 13%, the vegetable waste is crushed to a particle size ≤ 50mm, after crushing, it is put into the tempering preheating pool 2, and 201 tons of biogas slurry from the medium temperature anaerobic digester 3 is added to adjust the tempering preheating pool 2 The material total solid concentration is 7%, and through the hot water of the first hot water tank 13 to the temperature-increasing coil in the conditioning and tempering preheating pool 2, the temperature of the material in the conditioning and tempering preheating pool 2 is 37.5 ° C; The warmed fruit and vegetable waste is pumped into the first extrusion solid-liquid separator 4 for solid-liquid separation to obtain...

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Abstract

The invention discloses a coupling utilization system and method of anaerobic fermentation of fruit and vegetable wastes and afterheat of a bio-gas generator. The system comprises a pretreatment device, a tempering preheating tank, a first extrusion solid-liquid separator, a hydrothermal reactor, a high-temperature dry fermentation bin, a second extrusion solid-liquid separator and a drying machine which are sequentially communicated, and also comprises a medium-temperature high-efficiency anaerobic digestion tank, a bio-gas purifier, a bio-gas generator unit and a first heat exchange device, wherein liquid outlets of the first extrusion solid-liquid separator and the second extrusion solid-liquid separator are communicated with an inlet of the medium-temperature high-efficiency anaerobic digestion tank. According to the coupling utilization system of the anaerobic fermentation of fruit and vegetable wastes and the afterheat of a bio-gas generator, the bio-gas generation afterheat is combined with temperature-rising and heat preservation of anaerobic fermentation, intensified hydrolysis of solid residues, high-temperature dry fermentation of solid residues and drying of fermentation residues like solid organic fertilizers, so that the comprehensive energy sources and resource utilization efficiency of fruit and vegetable wastes are improved.

Description

[0001] [technical field] [0002] The invention relates to the field of organic waste treatment, in particular to a system and method for coupling anaerobic fermentation of fruit and vegetable waste with waste heat from a biogas generator. [0003] [Background technique] [0004] Fruit and vegetable waste refers to fruit and vegetable waste generated in daily life and agricultural production. Fruit and vegetable waste accounts for 25% to 30% of the total output of fruits and vegetables, and produces about 100 million tons of fruit and vegetable waste every year. Except for the part abandoned in the fields, most of the rest flow into municipal solid waste in the form of market waste. About 20% of the total amount of municipal solid waste. Fruit and vegetable waste has the following characteristics: 1) High moisture content and organic matter content, the moisture content is 81% to 92%, and the total volatile solid content accounts for more than 80% of the total solid, including...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12M1/107F02B43/10F02B63/04F02G5/00
CPCC12M21/04C12M43/08F02B43/10F02B63/04F02B2043/103F02G5/00Y02E50/30Y02T10/12Y02T10/30
Inventor 黎振廷曹婧
Owner 深圳市海吉星环保有限责任公司
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